Regional gravity modeling in terms of spherical base functions

A Comparison of Global and Regional GRACE Models for Land Hydrology

When using GRACE as a tool for hydrology, many different gravity field model products are now available to the end user. The traditional spherical harmonics solutions produced from GRACE are typically obtained through an optimization of the gravity field data at the global scale, and are generated by a number of processing centers around the...

The Impact of 3D Printing on the World Container Transport

Due to the recent hype around 3D printing technology regarding its disruptiveness for global manufacturing and supply chains, and thus transport in general, an attempt has been made to assess its impact on the global maritime container transport for the next 20 years. The first step was to gain insight of the 3D printing technology and its...

Use of Mobile Phone Data for Planning a Road Network: Application to the Country of Senegal

The thesis is the outcome of a research on using mobile phone data to understand mobility patterns in a country and to give advice about decisions on how to design the national and regional road network. It provides not only several practical solutions to the existing road network design problems in Senegal but also a methodological approach,...

Interval Forecasting for Airline Passenger Demand: An Application to Airline Network Development

In the past forty years, the volume of air travel has increased tenfold. While demand growth for OECD markets has slowed down in recent years, there is still a potential for markets where air services are currently not provided. It is the goal of the airline network development process to locate these potentially profitable markets. One of the...

Erasing Borders, European Rail Passenger Potential

This thesis is assessing the potential of the European rail passenger market with a 4 step model, with a gravity based trip distribution and assessment of level of service characteristics to determine total potential in demand and supply commissioned by Train2EU and Royal HaskoningDHV. The scope has been limited to long-distance (>100km) trips....

Using toponym co-occurrences to measure relationships between places: review, application and evaluation

While there is consensus that network embeddedness of cities is of great importance for their development, the precise effect is difficult to assess because of a lack of consistent information on relations between cities. This paper presents, applies and evaluates a rather novel method to establish the strength of relationships between places...

Adding new modes to existing transport demand gravity models: Methodology for adding disaggregate discrete choice parameters to an aggregate gravity model

This thesis describes a methodology for adding information about the preferences for new modes from external discrete choice models to exisiting transport demand gravity models. The methodology consists of 4 steps: (i) translation of deterrence functions towards discrete choice utility functions; (ii) linearization of non-linear translated...

Development of a numerical model for the Sumatra subduction zone constrained by satellite gravimetry: with special focus on gravity sensitivity studies

Satellite-derived gravity models have been used in modelling of several subduction zones, but not yet for the Sumatra subduction zone. There, gravity models can shed light on the geometry and density of the plate, and whether a slab tear is present under northern Sumatra, as seismic and tomographic studies present contradicting conclusions.<br/>...

The Impact of Noise in a GRACE/GOCE Global Gravity Model on a Local Quasi-Geoid

We present a local quasi-geoid (QG) model which combines a satellite-only global gravity model with local data sets using weighted least squares. The QG is computed for an area comprising the Netherlands, Belgium, and the southern North Sea. It uses a two-scale spherical radial basis function model complemented by bias parameters to account...

Gravity model for air passenger demand estimation: the addition of big data

Over the last decades, flying has become increasingly accessible and the global aviation industry is growing rapidly. This causes airports and airspaces to reach their capacity limits. Reliable estimation and forecasting of air passenger demand is very important for airlines in order to allocate resources effectively in a constrained and...

Information diffusion between Dutch cities: Revisiting Zipf and Pred using a computational social science approach

News travels fast and far, and the general idea is that the spatial extent of news coverage has increased over time. Information flows are always involved in systems of interdependent cities. This is the reason why George Zipf and Allan Pred, both pioneers of the urban systems literature, were eager to obtain data on these relations to...

Long‐Wavelength Gravity Field Constraint on the Lower Mantle Viscosity in North America

The long‐wavelength negative gravity anomaly over Hudson Bay coincides with the area depressed by the Laurentide Ice Sheet during the Last Glacial Maximum, suggesting that it is, at least partly, caused by glacial isostatic adjustment (GIA). Additional contributions to the static gravity field stem from surface dynamic topography, core‐mantle...

Temporal gravity model for important node identification in temporal networks

Identifying important nodes in networks is essential to analysing their structure and understanding their dynamical processes. In addition, myriad real systems are time-varying and can be represented as temporal networks. Motivated by classic gravity in physics, we propose a temporal gravity model to identify important nodes in temporal...

Choices for temporal gravity field modeling for precision orbit determination of CryoSat-2

In this paper we review the precision orbit determination (POD) performance of the CryoSat-2 mission where we used all tracking data between June-2010 and Jan-2023; with station and beacon coordinates provided in the ITRF2020 reference system, we use a mean gravity model, and we use spacecraft specific models for modeling drag and radiation...

Performance analysis on joint mode and destination choice: a tour-based model of Limburg

Comparing the performance of distribution functions and a discrete choice model, on a mode &amp; destination choice in a tour-based model. An discrete choice model is composed for a tour-based model. Both choice models are implemented in a large-scale tour-based model and the performances are compared.